Ziafar My suggestion would be to change the monitor's resolution (Windows Settings > System > Display), restart your computer, and change it back. And if that doesn't help, to change the DPI scalings, both system and user, to 96 (100%), and restart again. Sometimes the system does show strange behavior like this the first time a new driver is installed but then fixes itself after a restart, or after you force it to recalibrate for new settings.
Still, the underlying issue may be Windows 7, and the only fix (other than upgrading to 10) may be to play in DirectX 9 mode, which you should be able to do with the older driver. So this could be a project you come back to when you have some free time.